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  1. ,
    via vogella.com by Unknown author

    Any worker thread runs in background, since it is not intended to loop, is not connected to a Looper.for example doInBackground(). its implementation returns will be passed to onPostExecute() which runs on the UI thread.

Solutions on the web

via GitHub by audax
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by 4naxr
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by kanhaiyabgs
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Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by Ankita Sethi
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Can't create handler inside thread that has not called Looper.prepare()
via Google Groups by Esa Kylli, 10 months ago
Can't create handler inside thread that has not called Looper.prepare()
via GitHub by azapps
, 2 years ago
Can't create handler inside thread that has not called Looper.prepare()
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()	at android.os.Handler.(Handler.java:200)	at android.os.Handler.(Handler.java:114)	at android.widget.Toast$TN.(Toast.java:348)	at android.widget.Toast.(Toast.java:104)	at android.widget.Toast.makeText(Toast.java:262)	at android.widget.Toast.makeText(Toast.java:289)	at de.qabel.qabelbox.startup.fragments.CreateAccountResetPasswordFragment$1.onError(CreateAccountResetPasswordFragment.java:109)	at de.qabel.qabelbox.communication.callbacks.RequestCallback.onResponse(RequestCallback.java:55)	at okhttp3.RealCall$AsyncCall.execute(RealCall.java:126)	at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)	at java.lang.Thread.run(Thread.java:818)